Major League Baseball Rule 1.09 states that “the baseball shall weigh not less than 5 or more than 5¼ ounces” (www.mlb.com). Use these values as the lower and the upper control limits, respectively. Assume the centerline equals 5.125 ounces. Periodic samples of 50 baseballs produce the following sample means:

a. Construct an x̅ chart. Plot the sample means on the x̅ chart.

b. Are any points outside the control limits? Does it appear that the process is under control? Explain.

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X1 = 5.05 2 = 5.10 X3 = 5.15 4 = 5.20 5 = 5.22 X6 = 5.24 %3D